Django server cache select statement in Postgres DB - django

Question

I have a select Django statement like this:
import datetime
from django.db.models import Count, Q
from mobileapp.models import *
import math
from functools import partial
from django.utils import timezone
from mobileapp.decorators import logging__time
date=timezone.now()
first = date.replace(day=1)
last_month = first - datetime.timedelta(days=1)
subsidiaries = Subsidiary.objects.select_related('frequency').select_related('last_call').filter(user=user).annotate(number_of_calls=Count('calls', filter=Q(calls__start__gte=last_month, calls__start__date__lte=date)))
Even though today date is 6.30. the query in the logs look like this:
SELECT
"mobileapp_subsidiary"."id",
"mobileapp_subsidiary"."subsidiary_ref",
"mobileapp_subsidiary"."name",
"mobileapp_subsidiary"."address",
"mobileapp_subsidiary"."city",
"mobileapp_subsidiary"."coordinates_x",
"mobileapp_subsidiary"."coordinates_y",
"mobileapp_subsidiary"."phone_number",
"mobileapp_subsidiary"."frequency_id",
"mobileapp_subsidiary"."channel",
"mobileapp_subsidiary"."subchannel",
"mobileapp_subsidiary"."user_id",
"mobileapp_subsidiary"."day_planned",
"mobileapp_subsidiary"."customer_id",
"mobileapp_subsidiary"."last_call_id",
COUNT("mobileapp_calls"."id") FILTER (
WHERE (("mobileapp_calls"."start" AT TIME ZONE 'Europe/Ljubljana')::date <= '2020-06-11'::date AND "mobileapp_calls"."start" >= '2020-05-31T08:01:06.244114+00:00'::timestamptz)) AS "number_of_calls", "mobileapp_frequency"."name", "mobileapp_frequency"."calls_per_month", T5."id", T5."start", T5."end", T5."notes", T5."type", T5."user_id", T5."subsidiary_id", T5."order_id" FROM "mobileapp_subsidiary" LEFT OUTER JOIN "mobileapp_calls" ON ("mobileapp_subsidiary"."id" = "mobileapp_calls"."subsidiary_id") LEFT OUTER JOIN "mobileapp_frequency" ON ("mobileapp_subsidiary"."frequency_id" = "mobileapp_frequency"."name") LEFT OUTER JOIN "mobileapp_calls" T5 ON ("mobileapp_subsidiary"."last_call_id" = T5."id") WHERE "mobileapp_subsidiary"."user_id" = 2 GROUP BY "mobileapp_subsidiary"."id", "mobileapp_frequency"."name", T5."id"; args=(datetime.date(2020, 6, 11), datetime.datetime(2020, 5, 31, 8, 1, 6, 244114, tzinfo=<UTC>), 2);
I check the later logs and it is always query for 6.11 (even for previous days).
It looks like the query is cached somehow and called the same query every time, even that date is changed...
if I use Django-extensions shell and I run the function from there, it queries the right result.
Any idea?
EDIT:
Model for subsidiary looks like this:
class Subsidiary(models.Model):
subsidiary_ref = models.CharField(max_length=50)
name = models.CharField(null=False, max_length=80)
address = models.TextField(null=True, blank=True)
city = models.CharField(null=True, max_length=50)
coordinates_x = models.DecimalField(null=True, decimal_places=5, max_digits=9)
coordinates_y = models.DecimalField(null=True, decimal_places=5, max_digits=9)
phone_number = models.CharField(null=True, max_length=50)
frequency = models.ForeignKey(Frequency, on_delete=models.SET_NULL, null=True, db_index=True)
channel = models.CharField(null=True, blank=True, max_length=50)
subchannel = models.CharField(null=True, blank=True, max_length=50)
user = models.ForeignKey(User, related_name='subsidiaries', on_delete=models.SET_NULL, null=True, db_index=True)
day_planned = models.BooleanField(default=False)
customer = models.ForeignKey(Customer, on_delete=models.CASCADE, related_name='subsidiaries')
last_call = models.ForeignKey('Calls', related_name="subsidiary_reference", on_delete=models.DO_NOTHING, null=True,blank=True, db_index=True)